Re: Note well: Defensive punchers are the ones with less brain damage!
Not sure exactly what you are implying?
Bruno and Bowe would be classed as power punchers that ended fights quickly, but Bowe certainly shown signs of being “punch drunk”. Bruno may have other mental health issues rather than taking too many punches.
There are many other factors for Boxers showing brain damage other than their boxing style such as number of hard fights, genetics, skill, reflexes, luck, etc
There have been great defensive boxers from the past such as Benny Leonard and Willie Pep so better techniques have always existed and are not new.
Sweet Pea Whitaker and James Toney were great defensive boxers but they showed slurred speech.
In other words you need to take eye test.
Do not let success go to your head and do not let failure get to your heart.